package com.mall.gateway.filters;

import com.mall.common.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取request和resonse对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.判断是否是登录
        if (request.getURI().getPath().contains("/login")){
            //放行
            return chain.filter(exchange);
        }
        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if (StringUtils.isBlank(token)){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.判断token是否有效
        ServerWebExchange swe = null;
        try {
            Claims claimsBody = JwtUtils.parseToken(token);
            //获取解析令牌用户获取用户信息
            Object userId = claimsBody.get("id");

            //存储header中  传递用户信息
            swe = exchange.mutate()
                    .request(builder -> builder.header("id", String.valueOf(userId)))
                    .build();
        } catch (Exception e) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //6.放行
        return chain.filter(swe);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
